R. H. Everhardus, R. Gräting, L. Brandsma
Sep 2, 2010
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Journal
Recueil des Travaux Chimiques des Pays-Bas
Abstract
2,5-Dihydrothiophene can be obtained in reasonable yield by reaction of cis-1,4-dichloro-2-butene with anhydrous sodium sulfide in a mixture of methanol and dimethyl sulfoxide. The contaminating 3,4-epithio-1-butene can be removed by reaction with excess of Na2S. 3,4-Epithio-1-butene and 3,6-dihydro-1,2-dithiin have been obtained in good yields by treating trans-1,4-dibromo-2-butene and cis-1,2-dichloro-2-butene with Na2S and Na2S2, respectively.